Almost any burners now are going to support both CD and DVD burning, and they're also all plenty fast these days (22X or 24X for CDs, mostly). Even good optical drives are pretty cheap so I wouldn't break the bank for one that's a few times faster than the other. Sony, LG, HP, LiteOn are all good brands to go with.

You may need to determine if you want or need SATA or IDE. SATA is a faster connection, assuming your computer (motherboard) has SATA support and free connections.